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      SiteMesh技术
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        <h2 id="u7B80_u4ECB"><a href="#u7B80_u4ECB" class="headerlink" title="简介"></a>简介</h2><p>　　SiteMesh 是一个网页布局和修饰的框架，利用它可以将网页的内容和页面结构分离，以达到页面结构共享的目的。经常用来在JSP中实现页面布局和装饰（layout and decoration）的框架组件，能够帮助网站开发人员较容易实现页面中动态内容和静态装饰外观的分离。</p>
<h2 id="u5DE5_u4F5C_u539F_u7406"><a href="#u5DE5_u4F5C_u539F_u7406" class="headerlink" title="工作原理"></a>工作原理</h2><p>　　SiteMesh是基于Servlet的filter的，即过滤流。它是通过截取response，并进行装饰后再交付给客户。</p>
<h2 id="u4F7F_u7528"><a href="#u4F7F_u7528" class="headerlink" title="使用"></a>使用</h2><p>　　新建web工程，将sitemesh-2.4.1.jar复制到WEB-INF\lib目录下<br>　　修改web.xml，使其能处理所有的请求：<br><figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="title">filter</span>&gt;</span></span><br><span class="line">   <span class="tag">&lt;<span class="title">filter-name</span>&gt;</span>sitemesh<span class="tag">&lt;/<span class="title">filter-name</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="title">filter-class</span>&gt;</span>com.opensymphony.module.sitemesh.filter.PageFilter<span class="tag">&lt;/<span class="title">filter-class</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="title">filter</span>&gt;</span></span><br><span class="line"></span><br><span class="line"><span class="tag">&lt;<span class="title">filter-mapping</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="title">filter-name</span>&gt;</span>sitemesh<span class="tag">&lt;/<span class="title">filter-name</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="title">url-pattern</span>&gt;</span>/*<span class="tag">&lt;/<span class="title">url-pattern</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="title">filter-mapping</span>&gt;</span></span><br></pre></td></tr></table></figure></p>
<p>　　在Jsp页面中使用SiteMesh的标签库。还要导入SiteMesh的标签库，SiteMesh提供了两个标签库，一个是page还有一个是decorator<br>　　在WEB-INF下创建一个decorators.xml文件,内容如下<br><figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre></td><td class="code"><pre><span class="line"><span class="pi">&lt;?xml version="1.0" encoding="UTF-8"?&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="title">decorators</span> <span class="attribute">defaultdir</span>=<span class="value">"/decorators"</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="title">excludes</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="title">pattern</span>&gt;</span>/includes/*<span class="tag">&lt;/<span class="title">pattern</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="title">pattern</span>&gt;</span>/40*.jsp<span class="tag">&lt;/<span class="title">pattern</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="title">pattern</span>&gt;</span>/dwr/*<span class="tag">&lt;/<span class="title">pattern</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;/<span class="title">excludes</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="title">decorator</span> <span class="attribute">name</span>=<span class="value">"default"</span> <span class="attribute">page</span>=<span class="value">"default.jsp"</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="title">pattern</span>&gt;</span>/*<span class="tag">&lt;/<span class="title">pattern</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;/<span class="title">decorator</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="title">decorators</span>&gt;</span></span><br></pre></td></tr></table></figure></p>
<p>　　这是定义了模板页，也就是所有页面在返回给客户端之前，先在这里加上装饰，套上模板。defaultdir=”/decorators”说明了模板页的路径。<decorator name="default" page="default.jsp">模板页的名称。    <pattern>/*</pattern>表示对所有的response进行处理<br>　　在web下面建一个文件夹取名decorators。在decorators下面创建上面定义的模板页面default.jsp,内容如下:<br><figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="title">%@</span> <span class="attribute">page</span> <span class="attribute">language</span>=<span class="value">"java"</span> <span class="attribute">import</span>=<span class="value">"java.util.*"</span> <span class="attribute">pageEncoding</span>=<span class="value">"UTF-8"</span><span class="value">%</span>&gt;</span> </span><br><span class="line"><span class="tag">&lt;<span class="title">%@</span> <span class="attribute">taglib</span> <span class="attribute">uri</span>=<span class="value">"http://www.opensymphony.com/sitemesh/decorator"</span> <span class="attribute">prefix</span>=<span class="value">"decorator"</span><span class="value">%</span>&gt;</span> </span><br><span class="line"><span class="doctype">&lt;!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"&gt;</span> </span><br><span class="line"><span class="tag">&lt;<span class="title">html</span>&gt;</span> </span><br><span class="line">    <span class="tag">&lt;<span class="title">head</span>&gt;</span> </span><br><span class="line">    <span class="tag">&lt;<span class="title">title</span>&gt;</span><span class="tag">&lt;<span class="title">decorator:title</span> /&gt;</span><span class="tag">&lt;/<span class="title">title</span>&gt;</span> </span><br><span class="line">    <span class="tag">&lt;<span class="title">body</span>&gt;</span> </span><br><span class="line">        <span class="tag">&lt;<span class="title">p</span>&gt;</span>Add head decorator...<span class="tag">&lt;/<span class="title">p</span>&gt;</span> </span><br><span class="line">        <span class="tag">&lt;<span class="title">decorator:body</span> /&gt;</span> </span><br><span class="line">        <span class="tag">&lt;<span class="title">p</span>&gt;</span>Add foot decorator...<span class="tag">&lt;/<span class="title">p</span>&gt;</span> </span><br><span class="line">    <span class="tag">&lt;/<span class="title">body</span>&gt;</span> </span><br><span class="line"><span class="tag">&lt;/<span class="title">html</span>&gt;</span></span><br></pre></td></tr></table></figure></decorator></p>
<p>　　说明:<br>　　1. &lt;%@ taglib uri=”<a href="http://www.opensymphony.com/sitemesh/decorator" target="_blank" rel="external">http://www.opensymphony.com/sitemesh/decorator</a>“ prefix=”decorator”%&gt; 此处为decorator标签的声明。因为我们下面要使用到它<br>　　2. <decorator:title>把请求的原始页面的title内容插入到<title></title>,比如我们要请求index.jsp页面的时候。会把index.jsp中的title的内容放入到这里<br>　　3. <decorator:body>把请求的原始页面的body内容插入到<body></body>，我们在这句的前面加上了&lt;p&gt;Add head decorator…&lt;/p&gt;和&lt;p&gt;Add foot decorator…&lt;/p&gt;，相当于给我们请求的页面的body内容加上了头部和尾部.实现了模板功能。</decorator:body></decorator:title></p>
<p>　　在web下创建我们要请求访问的页面index.jsp，内容如下:<br><figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="title">%@</span> <span class="attribute">page</span> <span class="attribute">language</span>=<span class="value">"java"</span> <span class="attribute">contentType</span>=<span class="value">"text/html; charset=ISO-8859-1"</span> </span><br><span class="line"><span class="attribute">pageEncoding</span>=<span class="value">"ISO-8859-1"</span><span class="value">%</span>&gt;</span> </span><br><span class="line"><span class="doctype">&lt;!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"&gt;</span> </span><br><span class="line"><span class="tag">&lt;<span class="title">html</span>&gt;</span> </span><br><span class="line"><span class="tag">&lt;<span class="title">head</span>&gt;</span> </span><br><span class="line"><span class="tag">&lt;<span class="title">title</span>&gt;</span>SiteMesh Sample Site<span class="tag">&lt;/<span class="title">title</span>&gt;</span> </span><br><span class="line"><span class="tag">&lt;/<span class="title">head</span>&gt;</span> </span><br><span class="line"></span><br><span class="line"><span class="tag">&lt;<span class="title">body</span>&gt;</span> </span><br><span class="line">Welcome to the SiteMesh sample... </span><br><span class="line"><span class="tag">&lt;/<span class="title">body</span>&gt;</span> </span><br><span class="line"><span class="tag">&lt;/<span class="title">html</span>&gt;</span></span><br></pre></td></tr></table></figure></p>
<p>　　把web工程部署到tomcat容器中。输入<a href="http://localhost:8080/SiteMeshDemo/" target="_blank" rel="external">http://localhost:8080/SiteMeshDemo/</a></p>
<p>页面效果如下：<br>Add head decorator…<br>Welcome to the SiteMesh sample…<br>Add foot decorator…</p>
<p>　　不难发现，我们index.jsp中只有Welcome to the SiteMesh sample… 一句。但是在返回给我们之前套上了　default.jsp　模板页。在它的前面和后面分别加上了一句话。通过Sitemesh我们可以很容易实现页面中动态内容和静态装饰外观的分离。源码链接：<a href="/code/SiteMeshDemo.zip">SiteMeshDemo.zip</a></p>

      
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